Infiniti Q45. Manual - part 387

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

EC-187

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EC

5. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E315, F5

●

Harness for open or short between heated oxygen sensor 2 and ECM

>> Repair open circuit or short to ground or short to power in harness or connectors.

6. 

CHECK HEATED OXYGEN SENSOR 2 HEATER

Refer to 

EC-187, "Component Inspection"

 .

OK or NG

OK

>> GO TO 7.

NG

>> Replace malfunctioning heated oxygen sensor 2.

7. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

NBS001SD

HEATED OXYGEN SENSOR 2 HEATER

1.

Check resistance between HO2S2 terminals as follows.

2.

If NG, replace heated oxygen sensor 2.

CAUTION:

●

Discard any heated oxygen sensor which has been dropped
from a height of more than 0.5 m (19.7 in) onto a hard sur-
face such as a concrete floor; use a new one.

●

Before installing new oxygen sensor, clean exhaust system
threads using Oxygen Sensor Thread Cleaner tool J-43897-
18 or J-43897-12 and approved anti-seize lubricant.

Removal and Installation

NBS001SE

HEATED OXYGEN SENSOR 2

Refer to 

EM-23, "EXHAUST MANIFOLD AND THREE WAY CATALYST"

 .

Terminal No.

Resistance

2 and 3

5.0 - 7.0 

Ω

 [at 25

°

C (77

°

F)]

1 and 2, 3, 4

∞

 

Ω

(Continuity should not exist)

4 and 1, 2, 3

SEF249Y

EC-188

DTC P0075, P0081 IVT CONTROL SOLENOID VALVE

DTC P0075, P0081 IVT CONTROL SOLENOID VALVE

PFP:23796

Component Description

NBS001ZC

Intake valve timing control solenoid valve is activated by ON/OFF
pulse duty (ratio) signals from the ECM.
The intake valve timing control solenoid valve changes the oil
amount and direction of flow through intake valve timing control unit
or stops oil flow.
The longer pulse width advances valve angle.
The shorter pulse width retards valve angle.
When ON and OFF pulse widths become equal, the solenoid valve
stops oil pressure flow to fix the intake valve angle at the control
position.

CONSULT-II Reference Value in Data Monitor Mode

NBS001ZD

Specification data are reference values.

On Board Diagnosis Logic

NBS001ZE

DTC Confirmation Procedure

NBS001ZF

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine and wait let it idle for 5 seconds.

4.

If 1st trip DTC is detected, go to 

EC-193, "Diagnostic Procedure"

.

 WITH GST

Following the procedure WITH CONSULT-II above.

PBIB1842E

MONITOR ITEM

CONDITION

SPECIFICATION

INT/V SOL (B1)
INT/V SOL (B2)

●

Engine: After warming up

●

Selector lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

0% - 2%

2,000 rpm

Approx. 25% - 50%

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0075
0075
(bank 1)

Intake valve timing control 
solenoid valve circuit

An improper voltage is sent to the ECM 
through intake valve timing control solenoid 
valve.

●

Harness or connectors
(Intake valve timing control solenoid 
valve circuit is open or shorted.)

●

Intake valve timing control solenoid valve.

P0081
0081
(bank 2)

SEF058Y

DTC P0075, P0081 IVT CONTROL SOLENOID VALVE

EC-189

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EC

Wiring Diagram

NBS001ZG

BANK 1

TBWM1235E

EC-190

DTC P0075, P0081 IVT CONTROL SOLENOID VALVE

Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

10

P

Intake valve timing control 
solenoid valve (bank 1)

[Engine is running]

●

Warm-up condition

●

Idle speed

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]

●

Warm-up condition

●

Engine speed: 2,000rpm

7 - 12V

111

W/B

ECM relay
(Self shut-off)

[Engine is running]
[Ignition switch: OFF]

●

For a few seconds after turning ignition 
switch OFF

0 - 1.5V

[Ignition switch: OFF]

●

More than a few seconds after turning igni-
tion switch OFF

BATTERY VOLTAGE
(11 - 14V)

119

120

R
R

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

PBIB1790E